Abstract
THE practical difficulties of the direct determination of the indices of refraction and absorption of the opaque ore minerals have resulted in little work in this direction being accomplished. The progress of ore microscopy, however, has established the measurement of the reflectivity for (nominally) vertically incident light, whether by visual photometry as developed by Berek1 and Schneiderhohn, or by a photoelectric ocular as developed by Orcel2, as a routine process in the determination of these minerals. The figures obtained present evidence of certain regular relationships. Thus, amongst the simple sulphides, selenides and tellurides a general increase of reflectivity with increasing atomic number can be traced in such series as ZnS–CdS–HgS or PbS–PbSe–PbTe.
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